Cutting-machine for making ball-bearings.



No. 643,38l. Patented Feb. l3, I900. K. KEYSSNERV CUTTING MACHINE FOR MAIUNG BALL BEARINGS.

(Application filed June 26, 1897-) (No Model.)

" rrsn STATES PATENT OFFICE.

KARL KEYSSNER, OF NUREMBERG, GERMANY.

CUTTING-MACHINE FOR MAKING BALL-BEARINGS.

' SPECIFICATION forming part of Letters Patent No. 643,381, dated February 13, 1960.

Application filed June 26, 1897. Serial No. 642,507. (No model.)

To all whom it may concern;

Be it known that I, KARL KEYSSNER, a subject of the German Emperor, residing at Nuremberg, Kingdom of Bavaria, Germany, have invented certain new and useful Improvements in Cutting-Machines for the Mak ing of Bearing-Balls, of which the following is a specification.

The present invention relates to improvements in ball-cutting machines, tending to a complete rounding olf of the balls as their entire surface is equally exposed to the peculiar action of the cutting-rings.

The improvements comprise also advantageous arrangements in the construction of the machine by which space, material, and work are saved.

The annexed sketches illustrate the invention.

Figure 1 is a vertical middle section of the machine; Fig. 2, a horizontal section above the table; Fig. 3, a View of a grinding standaxle, and Fig. 4 a view of a cutting-plate from above.

The construction of the machine is such that on a table with the pillars a and the board I) there are several cutting-stands,

which are in common driven by the central gearing-axle c. the pulleys e, is mounted, like the vertical axle c, on the traverse-beam f and between the pillars a. The bevel-gear g on the gearing-shaft 01 moves two conical gear-wheels h and c' in opposite directions. The former is mounted fast on the axle 0, while the latter is loose and bears on its prolonged nave a spur-wheel 7c. The latter drives the Wheels m on the stand-axles Z, which move the upper cutting-plates w. The nether cuttingplates 0 are mounted on sleeves 19, which are mounted on the axles Z. The plates 0 are driven by the wheels g, which are set in motion by the spur-wheel r on the axle 0. Each stand has its bearing in an eccentricallybored bush 3, which can be turned by means of handles it in the eye a, so that the wheels m and q can be disengaged from the wheels and r and each stand shut out. To prevent the cutting-plates, which run in opposite directions, from turning the balls around one axle only, which makes the balls oval, the axle Z has been bent at right angles-- The gearing-shaft d, with that is, the upper part Z is eccentric to the lower part l--so that the plates 'n and 0 will also work eccentrically. By the eccentric movement the balls between the rings 1) are turned in different directions, and. so the whole surface of the balls is equally worked upon, which will make them evenly round. The eccentric motion of the rings 41 does not permit the balls to, be run in shaped ring grooves, wherefore a new kind of rings 0 is used with a rough file-like surface. The rings are so cut and arranged that the edges of the file strokes run against one another, and consequently work upon one another. The balls are worked in the manner of files by the plates at and 0 having a little difierent rate of velocity. The pieces of steel which are to be made into balls are cut ofi from round bar-sand are made to run first between coarse rings, then between fine, and afterward between smooth, ones, whereupon they are mathematically round and smooth. The necessary pressure between the rings 1; is produced by the tension of spiral springs w.

Having thus described my invention, what I claim is 1. A ball-grinding machine consisting of a series of cutting-stands mounted eccentrically to their drive-shaft, cutting-plates having annular cutting-faces, mechanism for rotating said stands, and means for throwing said mechanism in and out of gear with said stands, substantially as set forth.

2. In a ball-grinding machine, the combination of a main driving'shaft, a vertical shaft carrying a series of spur-wheels some of which are loosely, and others tightly mounted on said shaft, a plurality of cut ting stands composed of eccentric axles mounted in eccentric bushings and carrying spur-wheels adapted to mesh with the spurwheels on the vertical shaft, cutting-wheels mounted on said stands and having annular cutting-faces, means-for throwing said spurwheels in and out of gear, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

. KARL KEYSSNER.

Witnesses ALEX. WIELE, MAX SCHEIDIG. 

